ML20099A678
| ML20099A678 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/21/1992 |
| From: | Creel G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-88-20, TAC-M74392, TAC-M74393, NUDOCS 9207290345 | |
| Download: ML20099A678 (2) | |
Text
_
7
/BALTIMORE GAS AND ELECTRIC 1650 CALVERT ClJFFS PARKWAY e l.USBY, MARYL.AND 20657 4702 Gronot C. CnttL vect Parsionwe 4
NUCLE AR ENEROT I
1410) tao 4 466 July 21,1992 U. S. Nuclear Regulatory Commission Washington, DC 20555 NITENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50 318 Generic Ixtter 88-20, Individual Plant Examinationi (IPE) for Severe Accident Vulnerabilitics; Notification of Proposed Schedule Change (TAC Nos. hi74392: hi74393)
REFERENCES:
(a) letter from hir. G. C. Creel (BG&E) to NRC Document Control Desk, dated October 31,1989, ' Proposed Program for Completing the Individual Plant Examination - Initial Response to Generic lxtter No. 88 20" (b)
Letter from hir. D. G. hicDonald, Jr. (NRC) to hir. G. C. Creel (BO&E), dated February 1,1990, " Review of 60-Day Response to Generic Letter 88-20 Individual Plant Examination (IPE)"
Gentlemen:
As bricDy described in Reference (a), the Calvert Cliffs Nuclear Power Plant (CCNPP) Individual Plant Examination (IPE) Project has been designed to meet the requirements of Generic Ixtter88-20 and to enable the effective application of iisk technology to the operation and maintenance of the plant. Although conaiderable effort has been expended, emerging technical issues identified through the initial quantifications of the IPE indicate that further refinement of the Level I (Unit 1) PRA model is necessary to achieve more realistic and credible results. Ths refinement has adversely impacted both the Level I PRA schedule and the completion of the IxvelII PRA which builds on the results of the level 1 PRA.
I We have evaluated the remaining technical actions to complete the IPE and concluded we cannot meet the original commitment date of September 30,1992. We find it necessary to revise our scheduled submittal date to hiay 31,1993, in Reference (b), the NRC requested notification of any proposed schedule change and the reason for the change.
stWA
'd90060 v//
I I
h 9207290345 920721 PDR ADOCK 05000317 4
P PDR
6 Document Control Desk July 21,1992 Page 2 The CCNPP IPE is being developed by in. house engineers with minimal contractor support. This approach mects the spirit of the Generic lxtter to develop a continuing appreciation of severe accident behavior by having utility enginects involved in the analysis as well as the technical review.
The staf0ng of the IPE Project increased from two in January 1989 to the current level of six, with the rate of increase limited primarily by the availability of qualified PRA engineers. Although staffing had been aggtessively increased, delays in obtaining and training the IPE staf f resulted in some schedule crosion.
Calvert Cliffs Nuclear Power Plant's IPE Project is being designed to meet the requirements of Generic Letter M.20 and to enable the effective application of risk technology to the operation and maintenance of the plant. Technical improvements such as the addition of a front-end Failure hiodes and Effects Analysis for each component included in the IPE and the development of a component ranking are examples of the application orientation of CCNPP's PRA. In addition, we plan to maintain this PRA as a living analysis that is supported and used by a knowledgeable in-house staff. Ensuring the PRA has high quality and is a useful management tool has resulted in higher resource requirements than originally anticipated.
In summary, three issues resulted in the necessity to revise our origin:d IPE schedule:
1.
Emerging technicalissues requiring rennement of the 1.evel i PRA model; 2.
Initial delays in achieving full staffing; and 3.
Going beyond the basic IPE requirements in order to build an application-oriented and living PRA.
Further, we have concluded an additional increase of short-term staff would not improve our ability to meet the original schedcle. This is due to the high entry-level knowledge which is necessary for an engineer to become a productive member of the IPE project team. The tiaff addition would divert current resources for training with minimum productivity gain for achieving the original schedule.
Therefoie, we are notifying you of our proposed schedule change to submit the summary report of our IPE by hiay 31,1993.
Should you have any questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours,
/
', [ l l.
[jl 3;
I
{
GCC/JhiO! dim
' i j
,4 v
(
cc:
D. A. Brune, Esquire J. E. Silberg, Esquire 1
1 R. A. Capra, NRC D. G. hicDonald, Jr., NRC T. T. h1artin, NRC P. R. Wilson, NRC R.1. hiclean, DNR J.11. Walter, PSC
_ _.....